Trader Joe’s tiny coolers are selling like hot cakes. Why and how do products go viral?

​ A few months ago, Thaddeus Yan heard that Trader Joe’s was preparing to sell a fairly mundane new item: A miniature insulated cooler bag. Right away, he was on the lookout. When he went to London on a trip, he even deputized his mom to keep an eye out for the bags. Read More Breaking News, Latest News and Videos | CNN